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...just an observation from someone who lives in (obviously) a less user friendly city for bicycles. If the rack is easily removed to transfer between bicycles, how does it stay on your bike, locked up outside the store, when you go in to shop ? It doesn't appear to be something you can easily grab and carry with you, like most of the bags I use here, because of low life thieves and criminal opportunists. That would be a major concern for me. Whatever portion of the bag or carrier I leave on the bike needs to have some element of time consuming attachment to the bar or bicycle. Otherwise I'm going to be balancing whatever I bought on my handlebar again.
But I guess I could never use a bike that shiny for shopping anyway. * sigh*